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How improve the service life of LED drivers
2018-10-23 22:12:29
Depending on the LED current and voltage characteristics, it is desirable to use a constant current drive. It avoids the change of the forward voltage of the LED and causes the current to change, while the constant current stabilizes the brightness of the LED. In addition, the luminous flux of the LED is inversely proportional to the temperature, so the heat generation of the power supply and the well-designed heat dissipation system should be minimized during use. Thereby reducing the ambient temperature at which the LED operates. In order to ensure the overall life of the LED products, it is necessary to control the junction temperature of the LED within a certain range, that is, to control the working environment temperature of the LED product.
LED products mainly consist of LED chips and power supplies, heat-dissipating housings, and control circuits. Among them, the quality of LED power directly affects the quality of the product. In particular, LED street light products, because they are installed at high altitude, are inconvenient to maintain, and the maintenance cost is also large. LED is an energy-saving product, and the driving power supply must also meet the requirements of energy saving. In particular, the structure in which the power supply is installed in the luminaire is particularly important. Because the luminous efficiency of the LED decreases as the temperature of the LED increases. The power supply has high efficiency, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LEDs.
LED anti-impact ability is relatively poor, so it is necessary to strengthen this aspect of protection. Especially for some products that are installed outdoors, the start and stop of the grid load and lightning strikes will have an impact on the power supply. Therefore, the input end of the LED driving power supply should have a protection circuit for suppressing the surge, so as to avoid the switch instantly damaging the LED. To improve the life of the LED driver power supply, it needs to be improved from many aspects: use a higher life capacitor, improve the power efficiency, do a heat dissipation function of the power supply, and optimize the heat dissipation design of the lamp. The LED power supply belongs to the switching power supply. The quality and reliability of the switching power supply depend on its circuit design, production process, and quality of the device. Electrolytic capacitors are an integral part of high-power switching power supplies. The normal working life of the switching power supply depends on the life of the electrolytic capacitor used by the power supply. The life of the electrolytic capacitor depends on the life of the capacitor itself and the operating temperature. The working life of the electrolytic capacitor varies greatly at different temperatures.